Mu - subx/ex8.subx

From 608a7fa8d0faf9a3e3d182d9eabe969804443aab Mon Sep 17 00:00:00 2001 From: Kartik Agaram Date: Fri, 7 Sep 2018 15:08:54 -0700 Subject: 4536 --- html/subx/ex8.subx.html | 159 ------------------------------------------------ 1 file changed, 159 deletions(-) delete mode 100644 html/subx/ex8.subx.html (limited to 'html/subx/ex8.subx.html') diff --git a/html/subx/ex8.subx.html b/html/subx/ex8.subx.html deleted file mode 100644 index 70433c87..00000000 --- a/html/subx/ex8.subx.html +++ /dev/null @@ -1,159 +0,0 @@ - - - - -Mu - subx/ex8.subx - - - - - - - - - - -
- 1 ## example showing file syscalls
- 2 # Create a file, open it for writing, write a character to it, close it, open
- 3 # it for reading, read a character from it, close it, delete it, and return
- 4 # the character read.
- 5 #
- 6 # To run:
- 7 #   $ subx translate ex8.subx ex8
- 8 #   $ subx run ex8
- 9 # Expected result:
-10 #   $ echo $?
-11 #   97
-12 
-13 == 0x08048074  # code segment, after leaving room for ELF header and segment headers
-14 # instruction                     effective address                                                   operand     displacement    immediate
-15 # op          subop               mod             rm32          base        index         scale       r32
-16 # 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes
-17 
-18   ## creat(filename)
-19   bb/copy                         .               .             .           .             .           .           .               0x08049131/imm32/fname  # copy to EBX
-20   b9/copy                         .               .             .           .             .           .           .               0x180/imm32/fixed-perms # copy 0 to ECX
-21   b8/copy                         .               .             .           .             .           .           .               8/imm32/creat           # copy 8 to EAX
-22   cd/syscall                      .               .             .           .             .           .           .               0x80/imm8               # int 80h
-23 
-24   ## fd = open(filename, O_WRONLY, 0)
-25   bb/copy                         .               .             .           .             .           .           .               0x08049131/imm32/fname  # copy to EBX
-26   b9/copy                         .               .             .           .             .           .           .               1/imm32/wronly          # copy 1 to ECX
-27   ba/copy                         .               .             .           .             .           .           .               0x180/imm32/fixed-perms # copy 0 to EDX
-28   b8/copy                         .               .             .           .             .           .           .               5/imm32/open            # copy 5 to EAX
-29   cd/syscall                      .               .             .           .             .           .           .               0x80/imm8               # int 80h
-30   # save fd
-31   bb/copy                         .               .             .           .             .           .           .               0x08049125/imm32/fd     # copy to EBX
-32   89/copy                         0/mod/indirect  3/rm32/EBX                                          0/r32/EAX                                           # copy EAX to *EBX
-33 
-34   ## write(fd, "a", 1)
-35   # load fd
-36   bb/copy                         .               .             .           .             .           .           .               0x08049125/imm32/fd     # copy to EBX
-37   8b/copy                         0/mod/indirect  3/rm32/EBX                                          3/r32/EBX                                           # copy *EBX to EBX
-38   #
-39   b9/copy                         .               .             .           .             .           .           .               0x08049129/imm32/a      # copy to ECX
-40   ba/copy                         .               .             .           .             .           .           .               1/imm32/size            # copy 1 to EDX
-41   b8/copy                         .               .             .           .             .           .           .               4/imm32/write           # copy 4 to EAX
-42   cd/syscall                      .               .             .           .             .           .           .               0x80/imm8               # int 80h
-43 
-44   ## close(fd)
-45   # load fd
-46   bb/copy                         .               .             .           .             .           .           .               0x08049125/imm32/fd     # copy to EBX
-47   8b/copy                         0/mod/indirect  3/rm32/EBX                                          3/r32/EBX                                           # copy *EBX to EBX
-48   #
-49   b8/copy                         .               .             .           .             .           .           .               6/imm32/close           # copy 6 to EAX
-50   cd/syscall                      .               .             .           .             .           .           .               0x80/imm8               # int 80h
-51 
-52   ## fd = open(filename, O_RDONLY, 0)
-53   bb/copy                         .               .             .           .             .           .           .               0x08049131/imm32/fname  # copy to EBX
-54   b9/copy                         .               .             .           .             .           .           .               0/imm32/rdonly          # copy 0 to ECX
-55   ba/copy                         .               .             .           .             .           .           .               0x180/imm32/fixed-perms # copy 0 to EDX
-56   b8/copy                         .               .             .           .             .           .           .               5/imm32/open            # copy 5 to EAX
-57   cd/syscall                      .               .             .           .             .           .           .               0x80/imm8               # int 80h
-58   # save fd
-59   bb/copy                         .               .             .           .             .           .           .               0x08049125/imm32/fd     # copy to EBX
-60   89/copy                         0/mod/indirect  3/rm32/EBX                                          0/r32/EAX                                           # copy EAX to *EBX
-61 
-62   ## read(fd, b, 1)
-63   # load fd
-64   bb/copy                         .               .             .           .             .           .           .               0x08049125/imm32/fd     # copy to EBX
-65   8b/copy                         0/mod/indirect  3/rm32/EBX                                          3/r32/EBX                                           # copy *EBX to EBX
-66   #
-67   b9/copy                         .               .             .           .             .           .           .               0x0804912d/imm32/b      # copy to ECX
-68   ba/copy                         .               .             .           .             .           .           .               1/imm32/size            # copy 1 to EDX
-69   b8/copy                         .               .             .           .             .           .           .               3/imm32/read            # copy 3 to EAX
-70   cd/syscall                      .               .             .           .             .           .           .               0x80/imm8               # int 80h
-71 
-72   ## close(fd)
-73   # load fd
-74   bb/copy                         .               .             .           .             .           .           .               0x08049125/imm32/fd     # copy to EBX
-75   8b/copy                         0/mod/indirect  3/rm32/EBX                                          3/r32/EBX                                           # copy *EBX to EBX
-76   #
-77   b8/copy                         .               .             .           .             .           .           .               6/imm32/close           # copy 8 to EAX
-78   cd/syscall                      .               .             .           .             .           .           .               0x80/imm8               # int 80h
-79 
-80   ## unlink(filename)
-81   bb/copy                         .               .             .           .             .           .           .               0x08049131/imm32/fname  # copy to EBX
-82   b8/copy                         .               .             .           .             .           .           .               0xa/imm32/unlink        # copy 8 to EAX
-83   cd/syscall                      .               .             .           .             .           .           .               0x80/imm8               # int 80h
-84 
-85   ## exit(b)
-86   # load b
-87   bb/copy                         .               .             .           .             .           .           .               0x0804912d/imm32/b      # copy to EBX
-88   8b/copy                         0/mod/indirect  3/rm32/EBX                                          3/r32/EBX                                           # copy *EBX to EBX
-89   #
-90   b8/copy                         .               .             .           .             .           .           .               1/imm32/exit            # copy 1 to EAX
-91   cd/syscall                      .               .             .           .             .           .           .               0x80/imm8               # int 80h
-92 
-93 == 0x08049125  # data segment
-94 00 00 00 00  # fd
-95 61 00 00 00  # a: string to write to file: 'a'
-96 00 00 00 00  # b: space for string read from file
-97 2e 66 6f 6f 00 00 00 00  # filename: '.foo'
-98 
-99 # vim:ft=subx:nowrap:tw&
-
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